title: Volume registration based on 3-D phase correlation for tumor motion estimation in 4-D CT.
abstract: This paper presents a three-dimensional (3-D) volume registration method that uses 3-D phase correlation to estimate the respiration-induced tumor motion in four-dimensional (4-D) thorax computed tomography (CT) for radiation therapy. The proposed method is an extension of 2-D phase correlation method to 3-D volume registration. Given two CT volumes obtained from different respiration stages, the tumor motion is modeled as a translational shift between the volumes. The 3-D phase correlation is obtained from the 3-D inverse Fourier transform of a normalized cross power spectrum of the volumes. The tumor motion along three directions is estimated by locating the highest peak in the 3-D phase correlation. In order to improve the estimation accuracy, we extend the 3-D phase correlation to sub-voxel accuracy. Experimental results demonstrate the effectiveness of the proposed method relative to a conventional 2-D phase correlation-based method.
authors.forename: Xiaoyong
authors.initials: X
authors.lastname: Zhang
authors.forename: Noriyasu
authors.initials: N
authors.lastname: Homma
authors.forename: Makoto
authors.initials: M
authors.lastname: Abe
authors.forename: Norihiro
authors.initials: N
authors.lastname: Sugita
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Takai
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Narita
authors.forename: Makoto
authors.initials: M
authors.lastname: Yoshizawa
mesh_terms: D016477:Artifacts; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D056973:Four-Dimensional Computed Tomography / Q000379:methods*; D006801:Humans; D021621:Imaging, Three-Dimensional; D009038:Motion; D009369:Neoplasms / Q000000981:diagnostic imaging*